From e5a52298680d3af2cf384fbedbd8be22a165574f Mon Sep 17 00:00:00 2001
From: "H.J. Lu" <hjl.tools@gmail.com>
Date: Mon, 16 Dec 2024 18:56:55 +0800
Subject: [PATCH] tst-atomic.c: Mark as UNSUPPORTED when compiled with Clang

Since Clang can't remove the dead statement and issues an error:

tst-atomic.c:463:7: error: unsupported inline asm: input with type 'int64_t' (aka 'long') matching output with type 'typeof (*&mem)' (aka 'int')
  463 |   if (catomic_exchange_and_add (&mem, 11) != 2
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../sysdeps/x86/atomic-machine.h:213:3: note: expanded from macro 'catomic_exchange_and_add'
  213 |   __arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, __arch_c,    \
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  214 |                                 mem, value)
      |                                 ~~~~~~~~~~~
../sysdeps/x86/atomic-machine.h:199:12: note: expanded from macro '__arch_exchange_and_add_body'
  198 |                          : "=r" (__result), "=m" (*mem)                       \
      |                                  ~~~~~~~~
  199 |                          : "0" ((int64_t) cast_to_integer (__addval)),     \
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tst-atomic.c:487:7: error: unsupported inline asm: input with type 'int64_t' (aka 'long') matching output with type 'typeof (*(&mem))' (aka 'int')
  487 |   if (catomic_increment_val (&mem) != 3)
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/atomic.h:313:38: note: expanded from macro 'catomic_increment_val'
  313 | # define catomic_increment_val(mem) (catomic_exchange_and_add ((mem), 1) + 1)
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../sysdeps/x86/atomic-machine.h:213:3: note: expanded from macro 'catomic_exchange_and_add'
  213 |   __arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, __arch_c,    \
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  214 |                                 mem, value)
      |                                 ~~~~~~~~~~~
../sysdeps/x86/atomic-machine.h:199:12: note: expanded from macro '__arch_exchange_and_add_body'
  198 |                          : "=r" (__result), "=m" (*mem)                       \
      |                                  ~~~~~~~~
  199 |                          : "0" ((int64_t) cast_to_integer (__addval)),     \
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tst-atomic.c:501:7: error: unsupported inline asm: input with type 'int64_t' (aka 'long') matching output with type 'typeof (*(&mem))' (aka 'int')
  501 |   if (catomic_decrement_val (&mem) != 15)
      |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
../include/atomic.h:340:38: note: expanded from macro 'catomic_decrement_val'
  340 | # define catomic_decrement_val(mem) (catomic_exchange_and_add ((mem), -1) - 1)
      |                                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../sysdeps/x86/atomic-machine.h:213:3: note: expanded from macro 'catomic_exchange_and_add'
  213 |   __arch_exchange_and_add_body (__arch_exchange_and_add_cprefix, __arch_c,    \
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  214 |                                 mem, value)
      |                                 ~~~~~~~~~~~
../sysdeps/x86/atomic-machine.h:199:12: note: expanded from macro '__arch_exchange_and_add_body'
  198 |                          : "=r" (__result), "=m" (*mem)                       \
      |                                  ~~~~~~~~
  199 |                          : "0" ((int64_t) cast_to_integer (__addval)),     \
      |                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

mark tst-atomic.c as UNSUPPORTED when compiled with Clang.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>
---
 misc/tst-atomic.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/misc/tst-atomic.c b/misc/tst-atomic.c
index 65d0752c91..5576f682ca 100644
--- a/misc/tst-atomic.c
+++ b/misc/tst-atomic.c
@@ -16,6 +16,7 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#ifndef __clang__
 #include <stdio.h>
 #include <atomic.h>
 
@@ -636,3 +637,12 @@ do_test (void)
 }
 
 #include <support/test-driver.c>
+#else
+#include <support/test-driver.h>
+
+int
+main (void)
+{
+  return EXIT_UNSUPPORTED;
+}
+#endif